[PATCH 1/8] erofs-utils: lib: fix arithmetic overflow in large file handling

[Yifan Zhao <stopire@gmail.com>]

Assisted-by: Codex:gpt-6-astra
Assisted-by: Claude Code:deepseek-v4.1-flash-1017
Signed-off-by: Yifan Zhao <stopire@gmail.com>
---
 lib/compress.c | 2 +-
 lib/rebuild.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/compress.c b/lib/compress.c
index b079558..e1cfc05 100644
--- a/lib/compress.c
+++ b/lib/compress.c
@@ -560,7 +560,7 @@ static bool z_erofs_fixup_deduped_fragment(struct z_erofs_compress_sctx *ctx)
 	struct z_erofs_compress_ictx *ictx = ctx->ictx;
 	struct erofs_inode *inode = ictx->inode;
 	struct erofs_sb_info *sbi = inode->sbi;
-	const unsigned int newsize = ctx->remaining + ctx->tail - ctx->head;
+	const erofs_off_t newsize = ctx->remaining + ctx->tail - ctx->head;
 
 	DBG_BUGON(!inode->fragment_size);
 
diff --git a/lib/rebuild.c b/lib/rebuild.c
index 94dc66d..2fa8feb 100644
--- a/lib/rebuild.c
+++ b/lib/rebuild.c
@@ -262,7 +262,7 @@ static int erofs_rebuild_load_chunk_index(struct erofs_sb_info *dst_sb,
 			.buf = __EROFS_BUF_INITIALIZER,
 		};
 
-		map.m_la = i << chunkbits;
+		map.m_la = (erofs_off_t)i << chunkbits;
 		ret = erofs_map_blocks(inode, &map, 0);
 		if (ret)
 			goto err;
-- 
2.56.0